Two bugs in 0.9.6/0.9.7 caused an infinite restart loop after a Force update
signal: the CLI never reported the upgrade outcome, so `upgrade_requested`
stayed `true`; AND `applyAutoUpgrade` called `os.Exit(0)` even when the
target version equalled the current one, so systemd respawned and saw the
flag again.
- new Client.ReportUpgradeResult → POST /api/internal/agent/upgrade-result
- applyAutoUpgrade calls it on success / failure / no-op
- no-op case detected up front (same version) — skips Execute + Exit,
clears server flag instead
2e7cd7e8ed